That's a big 10-4! Landa's the best. I have an Excell 4 GPM 4000 PSI with a 13 HP Honda and it don't come close to a Landa.

One can start out with a direct drive unit like that Excell though...the water source has to be higher than the unit though. Unless it's force fed like a garden hose turned on. Better off feeding into a tank and then drawing out of that...still.